Atlas F Site 556-10 Missile Silo, Brainardsville / Ellenburg Center New York

In the farm-and-forest country near Brainardsville, New York, the former Atlas F Site 556-10 is easy to miss and hard to forget. A rural northern New York landscape once hid a vertical launch silo, a hardened control/support complex, and a thermonuclear missile assigned to the only operational U.S. ICBM squadron east of the Mississippi River. What looks today like a quiet Cold War remnant was built for one of the most demanding jobs of the early missile age: keeping an Atlas F ready during the tense years when liquid-fueled ICBMs formed the first generation of America's land-based nuclear deterrent.

Atlas F Site 556-10 was an SM-65F Atlas intercontinental ballistic missile launch facility associated with Plattsburgh Air Force Base, New York. It was part of the 556th Strategic Missile Squadron, assigned during the Atlas period to the 380th Bombardment Wing and later the 380th Strategic Aerospace Wing. The site was one of twelve Atlas F launch sites dispersed around Plattsburgh Air Force Base, with ten in New York and two in Vermont. Unlike later Minuteman Launch Facilities, an Atlas F launch complex had its own on-site hardened control/support facilities rather than a remote Minuteman-style parent Launch Control Center.

The site was accepted on 1962-12-09 according to the Plattsburgh Air Force Base history-office information packet. Strategic Air Command declared the 556th Strategic Missile Squadron operational later in December 1962, completing the Atlas ICBM deployment. The 556th Strategic Missile Squadron was inactivated on 1965-06-25 with the phaseout of the Atlas force. The site is no longer an active military installation. It is a decommissioned former Atlas F missile silo complex; current public access is not established.

Location, Landscape, and Site Description

Site 556-10 stands in the rural northern tier of New York, about 29 miles west-northwest of the former Plattsburgh Air Force Base airfield. Its placement near Brainardsville and Ellenburg Center put it within the dispersed Plattsburgh Atlas ring, far enough from the main base to reduce the chance that a single attack could destroy the whole squadron, but close enough for maintenance, security, and logistics crews to support the missile field from Plattsburgh.

The surrounding landscape is a mix of fields, tree lines, rural roads, and Adirondack-border settlement patterns. This was not an urban base with a runway and barracks. It was a hardened missile installation dropped into agricultural country and meant to be both operationally reachable and strategically dispersed. Public aerial imagery shows the characteristic former Atlas F surface pattern: a compact launch complex set within a rural parcel, with visible surface scars and buildings or pads reflecting the former silo/support layout.

A Plattsburgh Air Force Base history-office packet described the Atlas F silos around Plattsburgh as one-silo-per-site facilities. For the Plattsburgh Atlas field generally, it listed the silo diameter as 52 feet and the silo depth as 174 feet, with roughly 3,200 cubic yards of concrete and 600 tons of steel per silo. The same packet stated that the sites included living quarters for the launch crew and maintenance personnel and that two Quonset huts at each site were used for maintenance and limited spare-parts storage. It also listed Site 10's installation number as 7476, its permanent installation code as THZM, and its silo/easement tract acreage as 242.64 acres. Later disposal records in that same packet listed 8.71 acres as the "actual acreage" sold when the site left federal control.

Strategic and Cold War Context

Atlas F Site 556-10 existed because early intercontinental ballistic missiles forced the United States to rethink how nuclear deterrence could survive a surprise attack. The Atlas family was America's first operational ICBM, but the early Atlas D and E versions were relatively exposed and operationally cumbersome compared with later solid-fueled systems. Atlas F represented the hardened vertical-silo version of the Atlas weapon system. The missile was stored upright inside an underground reinforced-concrete-and-steel silo, raised to the surface by elevator for launch, and supported by a launch-control and service complex built into the same site.

The Plattsburgh field had an unusual geographic role. Most U.S. ICBM fields were in the Great Plains and western interior. The 556th Strategic Missile Squadron was the only Atlas F ICBM unit east of the Mississippi River, and New York State Military Museum materials describe the Plattsburgh Atlas sites as a twelve-missile squadron surrounding Plattsburgh Air Force Base. This meant that Site 556-10 was part of a missile field whose location put land-based strategic missiles into the far northeastern United States, near the Canadian border, Lake Champlain, and the Adirondack region.

The strategic logic was hardening and dispersal. No single launch site was expected to be invulnerable. Instead, each site was separated from the others, built underground, and supported by alert crews, security forces, communications systems, propellant systems, and maintenance teams. The goal was to complicate enemy targeting and preserve a retaliatory force long enough to deter attack. Atlas F still required liquid oxygen and careful countdown procedures, but its vertical silo configuration and stored RP-1 fuel made it faster to prepare than the earlier horizontal Atlas D and E launcher systems.

Construction and Activation

Planning and construction for the Plattsburgh Atlas F field began during the national rush to deploy first-generation ICBMs. A Plattsburgh Air Force Base history-office packet stated that soil testing for the missile sites was conducted in January 1960 and that excavation started in June 1960, with Raymond International identified as the prime contractor. This work was not a small concrete job. Each Atlas F site required a deep silo, a hardened control/support structure, propellant and utility systems, access features, security provisions, and facilities for crews and maintenance personnel.

Site 556-10 was listed in that packet as Brainardsville, New York, Clinton County, and was accepted on 1962-12-09. It was one of the later New York Atlas F locations to be accepted, after several other Plattsburgh sites and before SAC declared the full 556th Strategic Missile Squadron operational later in December 1962. SAC Missile Chronology records that headquarters declared the 556th Strategic Missile Squadron at Plattsburgh operational on 1962-12-20 and noted that this completed the deployment of the Atlas ICBM force.

The site's construction and real-estate footprint also illustrate how large the original federal land actions were compared with the small residual parcels often visible today. The Plattsburgh packet listed Site 10's silo/easement tract acreage as 242.64 acres, but the actual acreage sold after deactivation as 8.71 acres. That pattern suggests a federal acquisition/easement footprint tied to construction, access, and safety/security needs, followed by a smaller disposal parcel when the missile mission ended.

Missile System and Technical Role

Site 556-10 housed the SM-65F Atlas, the final operational silo-based version of the Atlas ICBM. Site 10's assigned missile was General Dynamics serial number 61-2572, manufacturing number 86F, Air Force tail number 572. The missile was accepted on 1962-06-27 and delivered on 1962-07-02. The site itself was accepted later that year, on 1962-12-09.

The Atlas F was a liquid-fueled, stage-and-a-half missile. It used RP-1 kerosene fuel and liquid oxygen oxidizer. In alert service, the missile could keep RP-1 aboard, but liquid oxygen was not continuously loaded because it boiled off and required special handling. In practice, an Atlas F alert posture meant that the missile, launch equipment, propellant systems, crews, communications, and security forces were ready to begin the launch sequence on order. It did not mean the missile was continuously raised above the silo, and it did not mean the missile was continuously filled with liquid oxygen. If a launch order and valid procedures were initiated, the site would open its massive silo doors, load liquid oxygen, raise the missile, complete checks, and launch if the order proceeded through the required sequence.

The Atlas F was housed in a "silo launcher" complex, kept vertical, raised out of the silo for launch after the two heavy overhead doors opened, and powered by RP-1 and liquid oxygen. The same source states that the Atlas F carried a Mark IV reentry vehicle with a W-38 nuclear warhead of approximately 3.8 megatons and had a range of about 6,000 miles. A Plattsburgh information packet gives the missile's designed range as 6,325 statute miles, missile length as 80 feet, takeoff thrust as approximately 360,000 pounds, and takeoff weight as about 130 tons. These figures vary slightly by source and configuration, but they describe the public, general capability of the Atlas F system rather than any sensitive modern operational information.

Operational History

Atlas F Site 556-10's active operational story was brief but intense. It belonged to a missile system fielded at high speed, during a period in which the United States was moving from experimental and first-generation ICBMs toward more survivable solid-fueled systems. The 556th Strategic Missile Squadron operated the Plattsburgh Atlas F sites from the early 1960s until the Atlas phaseout in 1965. The sites were built around Plattsburgh Air Force Base rather than on the base itself, so day-to-day operations depended on a dispersed support system: launch crews, missile maintenance teams, propellant specialists, security police, communications personnel, civil engineers, and command elements at the parent wing.

The 556th field was still coming together during the Cuban Missile Crisis of October 1962. SAC Missile Chronology records that the first few Series F Atlas ICBMs at the 556th Strategic Missile Squadron, Plattsburgh AFB, were put on alert during the crisis, while several other Atlas F squadrons were required to place all twelve missiles on alert. Site 556-10 should not be described as one of those specific crisis-alert missiles without further evidence, because Site 10 was not accepted until 1962-12-09. The better reading is that the Plattsburgh field was nearing completion during the crisis, that some of its early missiles entered alert posture, and that Site 556-10 joined the squadron's operational force after acceptance in December 1962.

Once accepted, Site 556-10 formed part of a twelve-site system that could keep missiles on strategic alert around the clock. A Plattsburgh Air Force Base packet stated that the wing had thirteen Atlas F missiles for twelve silos, allowing each silo to have one missile with an additional missile retained as a spare. If a missile in a silo was scheduled for maintenance, the spare could be sent to replace it, allowing the wing to maintain twelve ready-to-launch missiles seven days a week. This is the kind of practical operational detail that explains why these places were more than concrete holes in the ground: readiness depended on logistics, maintenance substitution, transportation, security, fueling support, and the constant effort to keep an early liquid-fueled weapon system credible.

Daily service at Site 556-10 would have involved the routines common to Atlas F launch complexes: crew duty in the control/support area, monitoring of missile and site systems, inspections, communications checks, maintenance visits, security response, periodic training, and propellant-system readiness. Unlike a later Minuteman LF, this Atlas F site was not merely an unmanned remote silo watched from a distant LCC. It was a more self-contained launch complex with crew and support spaces integrated into the site.

Site 10's Atlas missile was General Dynamics serial number 61-2572, manufacturing number 86F, Air Force tail number 572. After its Plattsburgh service, that missile was later launched on 1968-06-22 with a Re-Entry Vehicle Test payload identified as RMP-B-8.

Deactivation and Disposal

The Atlas F system was obsolete almost as soon as the last fields became fully operational. Solid-fueled Minuteman missiles were already entering service and offered major advantages in reaction time, maintenance burden, survivability, and long-term reliability. Secretary of Defense Robert McNamara announced in November 1964 that remaining first-generation ICBMs, including Atlas and Titan I, would be phased out by the end of June 1965.

Squadron and site-index sources identify 1965-06-25 as the deactivation/inactivation date associated with the 556th Strategic Missile Squadron and the end of Atlas F service at Plattsburgh.

The Plattsburgh history-office packet gives unusually useful disposal data for Site 10. It lists the site's total construction cost as $5,025,481.65. It lists 8.71 acres as the actual acreage sold, a sale price of $6,750, the buyer as the Town of Ellenburg, and the quitclaim date as 1967-11-17. That sale record helps show what happened after the missile left alert status: the government did not preserve most Atlas F sites as historic monuments. It stripped them of their active strategic mission, disposed of the properties, and left local governments and private owners to deal with the massive underground remains.

Environmental records later brought the former missile site back into federal accounting. The U.S. Army Corps of Engineers 2015 New York FUDS inventory lists PLATTSBURGH ATLAS S-10, property number C02NY0215, in Clinton County, Ellenburg Center, with a CON/HTRW category. A GAO FUDS cleanup table listed PLATTSBURGH ATLAS S-10, C02NY0215, in Clinton County, with a cleanup action under way and WDT noted. A later Defense Environmental Restoration Program table lists PLATTSBURGH ATLAS S-10 / NY29799F110100 among New York FUDS properties achieving final response complete before fiscal year 2021. Those records do not by themselves describe every structure or cleanup action at the site, but they confirm that the former Site 10 was tracked in federal environmental-restoration records.

Current Status and Site Use

Atlas F Site 556-10 is no longer an active military installation. It is a decommissioned former Atlas F missile silo complex. The 1967 disposal record states that the former site was sold to the Town of Ellenburg, but current ownership and current use were not independently verified.

Public imagery and former-missile-site documentation indicate that surface remains or site scars are visible, but access should be assumed non-public unless a current owner or public authority explicitly states otherwise. Former Atlas sites can contain dangerous underground spaces, flooding, confined-space hazards, unstable structures, contamination concerns, and legal trespass issues. The appropriate current-use description is: former Atlas F silo complex, disposed after deactivation, later tracked as FUDS PLATTSBURGH ATLAS S-10 / C02NY0215, with current access not publicly established.

Chronology

• 1960-01 Soil testing was conducted for the Plattsburgh Atlas F missile sites.
• 1960-06 Excavation for the Plattsburgh Atlas F sites began, with Raymond International identified as the prime contractor in a Plattsburgh Air Force Base history-office packet.
• 1961-10-01 The 556th Strategic Missile Squadron was organized at Plattsburgh Air Force Base for Atlas F operations.
• 1962-06-27 Site 556-10's assigned missile, General Dynamics serial number 61-2572 / manufacturing number 86F / Air Force tail number 572, was accepted.
• 1962-07-02 The assigned missile for Site 556-10 was delivered.
• 1962-10 During the Cuban Missile Crisis, the first few Plattsburgh Atlas F missiles were placed on alert; Site 556-10 had not yet been accepted and should not be assumed to have been one of those missiles without further source support.
• 1962-12-09 Site #10, Brainardsville, New York, Clinton County, was accepted.
• 1962-12-20 Strategic Air Command declared the 556th Strategic Missile Squadron at Plattsburgh operational, completing Atlas ICBM deployment.
• 1965-04-30 The 556th Strategic Missile Squadron's last operational day is reported in broader 380th wing history accounts.
• 1965-06-25 The 556th Strategic Missile Squadron was inactivated as Atlas missiles were withdrawn from service.
• 1967-11-17 The former Site 10 property was quitclaimed/sold to the Town of Ellenburg; the Plattsburgh packet lists 8.71 actual acres, a sale price of $6,750, and a total construction cost of $5,025,481.65.
• 1968-06-22 The missile formerly assigned to Site 556-10 was later launched with a Re-Entry Vehicle Test payload identified as RMP-B-8.
• 2001 A GAO FUDS cleanup table listed PLATTSBURGH ATLAS S-10 / C02NY0215 in Clinton County with cleanup under way and WDT noted.
• 2015 The USACE New York FUDS inventory listed PLATTSBURGH ATLAS S-10 / C02NY0215 at Ellenburg Center, Clinton County, with a CON/HTRW category.
• 2021 A Defense Environmental Restoration Program table listed PLATTSBURGH ATLAS S-10 / NY29799F110100 among New York FUDS properties achieving final response complete before FY21.

Plattsburgh history-office packet on Atlas Missile Deployment

Read about the Atlas at Plattsburgh AFB

All Atlas Missile Silo Locations